Grinding-mill



(No Model.)

B. MORRELL.

GRINDING MILL.

Patented June 29, 1886.

INVENTOR:

Nv PEYERS. PholvLxthognphcr. Washmmgn, n. C.

Ihvrrnn STATES FFIC EQ ROBERT MORRELL, OF SUMMIT, NFAV JERSEY.

GRINDING-MILL.

SPECIFICATION forming part of Letters Patent No. 344,490, dated June 29.1856.

Application tiled March 25, 1985. Renewed December 3, 1885.

To all whom it may concern.-

Be it known that I, ROBERT MonRELL, a citizen of the United States,residing at Summit, in the county of Union and State of New Jersey, haveinvented new and useful Improvements in Grinding-Mills, of which thefollowing is a specilication.

My invention relates to grinding-mills, in which a series of pairs ofgrinding-rolls for treating the grain by successive reductions are usedalternately with a series of concave screens, having revolving brushesand fans to run the chop through successively to each reduction forseparating the fine material from that which requires further reduction;and it consists, essentially, of a plan of construction in which millsof four or five break capacitythat is, having four or five pairs ofrolls and the complement of screens therefor, which is the preferredarrangement in the trade, because these numbers of breaks and separatorsgive much the best results practically can be comprised in a singlemachine, of which the height will be within the limits of the usualheight between the floors of ordinary millbuildings, without materialincrease of longitudinal dimensions, for greater simplicity ofconstruction and setting up, and particularly for greater convenience ofthe miller, besides the advantages of having the mill wholly con tainedin one story or on one floor as compared with the present constructionof these mills of like capacity, which extend through one floor to theheight of two stories of the building, and sometimes more, in which formthe necessary frequent inspections of the working of each pair of rollsand attentions to the bearings and the like require constant laboriousclimbing up and down, whereas by the improved construction which Ipropose the attendance may be almost wholly given from the floor onwhich the mill stands, the climbing of stairs being at the most limitedto say three or four steps.

My invention also consists of an improved contrivance of the exhaustapparatus for drawing off the fine dust from the chop, and also of asimpler contrivancc of the driving-gear for the rolls than is requiredin the mills as now constructed, all as hereinafter fully described andclaimed, reference being made to the aceompanying drawings, in whieh-=Serial No. 194,601. (No Infidel.)

Figure l is a side elevation of my improved mill with the casing removedand portions of some of the parts broken out, also with some of theparts in section. Fig. 2 is an end ele vation with some parts insection.

In a case, a, of about nine or ten feet high, a little greater length,and the usual width, I arrange the first pair of break-rolls, I), in theupper corner of one end, under the usual feedhopper, c, and its roll (I,and directly under said rolls I arrange the first concave screen. 0,with its fan f, and brushes g, for brushing the fine flour through thescreen and discharging the coarse chop down the chute h to the next pairof break-rolls, vi, which, together with the screen j and fan 7ttherefor, I arrange below and a little to one side of the first screen,as they are now arranged in the mills of this kind as at presentconstructed, except that in my plan the screens all turn the same way,while in the present mills the screen j and fan L are adjusted for therevolving of the fan in the opposite direction to that of fan f, todischarge into the next pair of rolls, located under screen 0, and thewhole series of rolls and screens is continued vertically in this zigzagform, the height being, as above stated, equal to-or greater than twostories of the building. In some eases the screens have been placed in adirect line, one below another, with the rolls located in about the samerelations as rolls 2' are to screen 0, with all the fans turning in thesame direction; but this requires greater height than the zigzagarrangement. Now, as two pairs of rolls and the screens therefor, withthe feed mechanism above and the conveyer Z below, can be well andconveniently bestowed between two floors, with economy of space andwithout any part being out of reach of the miller on a stand of two orthree steps or so, I construct the mill in two of these inclined rangesof rolls and screens, located side by side in a case havingcorresponding longitudinal extension, and I locate the third pair ofrolls, m, in the upper part and near about the middle of the case, andprovide an elevator, 11, in suitable relation with screen j and fan 76,to receive the chop from them, and deliver it to rolls m, under which Iarrange the screen 0 and fan 11, belonging to them, with the fourth pairof rolls, q, and the screen 8 and fan tfor them below and in the sameinclination as the first range, with the fifth pair of rolls it belowscreen 8, with which the final reduction is effected, and from which thefine flour discharges into the conveyer Z along with that from all thescreens to be conveyed to such other dressingmachines as may beemployed. Thus it will be seen that with the employment of but a singleelevator of simple form and small size I am enabled to bring theseelements into much more desirable and convenient form, both for spaceand attendance, than they are now arranged, and, besides, I effectconsiderable simplification of construction as to the internalarrangement of partitions and chutes, also as to the arrangement of theexhaust apparatus for drawing off the particles of light matter from thechop, and also as to the arrangement of the driving-belt for working therolls, as follows:

Under the screens the space is all free for the fine flour forcedthrough them to fall directly into the conveyer Zwithout any chutes,except it may be preferred to employ the chutes w between the twoscreens of each range to prevent any of the flour from the upper screenlodging on the lower one; but these may not be required. For the restthe chutes h, together with the screens and the rolls and the partition00, back of the elevator, prevent the escape of the chop into theflour-space below, and for drawing off the light matters from the chopby the suction-fan y the arrangement of the rolls and the form of thecase enable the arrangement of a vertical air-tank, z, from directlyover each pair of the rolls to the top of the case, where they connectwith a horizontal trunk, a, extending along one side of the top of theease to said fan, so as to pass the elevator-cup b at one end, inconsequence of which I make the vertical tanksz with the slantrepresented in Fig. 2; but they may extend in full breadth to the top ofthe case, if preferred, and the one over the rolls m, located near thetop of the case, may extend up through the top of the case for therequisite vertical dimensions that is prevented below the top of thecase by the height of said rolls.

For the driving-gear of the rolls the belt 0', from thedriving-pulley 6,located near the top of the end of the case where the first pair ofrolls, 7), are, is made to drive all the rolls without any idlers bypassing first around the pulley of one of rolls m, thence back aroundthe pulley of one of rolls 1), thence around the pulley of one of rollsq, thence around the pulley of one of rolls i, thence around the pulleyof one of the last pair of rolls a, and thence back onto thedriving-pulley, thus saving the cost, wear, and attention of idlers orduplicate driving-gear that have to be employed in the single verticalrange arrangement.

The rolls of each pair are geared together in the usual manner forturning one by the other, and are differently speeded. The fans may bebelted separately to the rolls, as indicated, or be otherwise geared, aspreferred.

In my improved mill the rotating portion of the separators may consistof brushes and fans, as herein shown, or be otherwise constructed, and Iam not limited by any particular construction of the same.

WVhat I claim, and desire to secure by Letters Patent, is-- 1. In agrinding-mill consisting of a series of grinding-rolls and separators inthe alternate arrangement described, the said series of rolls andseparators arranged in two inclined ranges located side by side,incombination with an elevator intermediately arranged therewith,substantially as described.

2. In a grinding-mill consisting of a series of grinding-rolls andseparators in the alternate arrangement described, the said series ofrolls and separators arranged in two inclined ranges located side byside,in combination with an elevator intermediately arranged there with,the partition w,and the chutes h, substantially as described.

3. In a'grinding-mill consisting of a series of grinding-rolls andseparators in the alternate arrangement described, the said series ofrolls and separators arranged in two inclined ranges located side byside,in combination with an elevator intermediately arranged therewith,the partition :12, chutes h, and the vertical air-trunks extending upfrom above the rolls to the top of the case, substantially as described.

4.. In a grinding-mill consisting of a series of grinding-rolls andseparators in the alternate arrangement described, the combination ofthe said rolls and separators arranged in two inclined ranges locatedside by side, the driving-pulley, the belt running directly from one setof rolls to another of the two ranges alternately throughout the wholeseries, Whereby one of the rolls of each pair is driven, andconnecting-gearing whereby the other roll of each pair is driven,substantially as described.

In witness whereof I have hereunto signed my name in the presence of twosubscribing witnesses.

ROBERT MORRELL.

IIO

